Hii Kartik..

Considering your interest in mathematics,  drawing and designing the best course I would prefer to you is either B.Arch. Architecture is a mix of art, science, math and business so it requires you to have a robust background in a variety of subjects. It also requires a five-year course of study rather than the standard four years for an undergraduate degree. After B.Arch you can also do your masters in architecture doing M.Arch.

I am providing you the list of top 10 architecture colleges in India-

• School Of Planning And Architecture, Delhi
• Indian Institute Of Technology, Kharagpur
• Sir J. J. College Of Architecture, Mumbai
• Birla Institute Of Technology, Mesra
• Jadavpur University, Kolkata
• Chandigarh College Of Architecture, Chandigarh
• Jamia Milia Islamia University
• National Institute Of Technology, Tiruchirapalli
• Center for Environmental Planning and Technology University, Ahmedabad
• IIT Roorkie

Hope this helps.

Best of luck for future..